Attachment-plug-cap snubber



u menue July. 11e,v reza?.

UNITED STATES nox HERBERT CUNNINGHAM, or JACKSON, MICHIGAN, AssIeNon ToTHE REYNOLDS' srmNe coMrANY, or JAcxsoN, MIcHrGAN. v

A'rrAcHmENT-rLUG-CAP sNUeBER.

Application led February 3, i928. Serial No. 251,635; i

The invention relates to an attachment plug ca snubber.

The o ject of the present mvention 1s to improve the construction ofremovable caps 'for attachment plugs and to provlde a simple, practicaland eiicient attachment plug cap equipped with snubbing means adaptedtoreceive and have coiled around them the' bared ends of the'wires andcapable of re lo taining the coiled wires in osition and of cooperatingwith the bin ing screws or posts for securing the bared terminals to thecontact plates and of relieving the binding screws or posts of strain. n

With these and other objects in v1ew, the invention consists' in theconstruction and novel combination and arrangement of parts hereinafterfully described, illustrated 1n the accompanying drawings and pomted outin the claims hereto appended, it being understood that various changes`in the form?. proportion and minor details of construct-ion, within thescope of the claims may be resorted to without departing from the spiritor sacrificing any of the advant'a es of the invention.

Fi re 1 is a plan view of a removable attac ent plug cap constructed ina rdance with this invention, showing the in terior thereof.

Fig. 2 is a vertical sectional view o f the same.

Fig. 3 is a similar view taken at right to Fig. 2.

of the contact plates.

In the accompanying drawings in which is illustrated the preferredembodiment of the invention, 1 desi attachment plug cap consisting ofashell of the usual formation and constructed of molded bakelite or othersuitable material and provided with a central opening.y 2

osof the cap and are to the enlargean les Fig. 4 is a detail perspectiveview of onegnates .a removable.

through which extends a cord 3 compris,-r

ments SQby suitable fastening`- ld fexfzices 10 which may be of anydesired .construction as will be readily understood. The contact plateswhich are spaced apart 'are provided with integralvblades or ingersllwhich extend into the attachment plug (not shown) in the usual manner.The terminal portions of the bared ends of the wires 4 and 5 are bentaround the binding screws 7 and are clamped by the heads of the same. Inorder to relieve the clamped portions of the bared ends of the wires ofstrain to prevent them from becoming accidentally disengaged from thebinding screws, the contact platesare provided with snubber lugs 12located aldjacent to the binding screws and cooperating therewith tomaintain the bared ends of the Wir lin engagement with the bindingscrews and provided with slots 13. Each of the snubber lugs has anapproximately circular slot extending inwardly from one side edge ofthesnubber lug and terminating short of the opposite side edge and forminga constricted entrance 14. The bared portion of the wirev adjacent tothe terminal thereof is coiled around the snubber lug, a portion of thecoils 15 being received within the slot13. The bared portionof the wireis coiled tightly around the snubbing lug and in the slot thereof andthe end of the wire after such coiling is bent around the binding screwand clamped in place by the latter. The coils 15- of the bared portionsof the wire expand within the circular slot 13 and bind againsteach-other 4and the walls of the slot suiiciently to assist in retainingthecoils inthe slot and the wires by being coiled around the snubbinglugs have their vclamped terminals relieved of strain and a pull on thecord will be snubbed by the lugs and will not be transmitted to theclamped terminals of the wires which will not be Aliable to becomeloosened or disconnected from the clamping screws by the pulls andstrains toy which the cord isusually subjected 10o inthe use of thedevice.

In order to revent any possibility of short-circuiting in the cap, thelatter is provided with a partition' 16 molded with the cap 'andextending across the same and hav- 105 l ing its longitudinaledhgearranged in flush united with thehsame at the bottomand side lWallsof the cavit The central portion of the partition is iametricallydisposed and the end portions17 are arranged at an angle 'to the centralportion andare located at the I 'adjacent ends of the seats -for thecontact M plates. The angularly related end portionsl of the partition,which extend in .op osite directions, ,project outwardly beyon the facesof the said seats and form abutments for the adjacent ends of thecontact plates. 'lhe partition eli'ectually separates the contact platesand is adapted to prevent acci-' dental short-circuiting Within thevcavity of the attachent plug cap. One side edge of each blade or finger11 is located in the adjacent. angle formed by thel central and nal of awire coiled around it and provided with a slot receiving a portion ofthe coil,

, and havinga constricted entrance.

2. An attachment lug cap having-.spaced contact plates provi ed withintegral snubbing lugs .at one end and blades at the other end, each lugbeing adapted to have a bared terminal of a wire coiled around it andprovided with a slot receiving a portion of the coil, and having aconstricted entrance, and a binding screw for each of the contact platesarranged between the lug land the blade adjacent to the snubber lug forclamping the end of the wire, the snubber lug co-operating with thebinding screw to confine the wir beneath the head of the screw.

3. An attachment plug cap consisting of a shell of insulating materialforming a cavity for contact plates and rovided at opposite sidesthereof with seats or the contact plates, said shell being also providedwith an insulating partition interposed between the contact plates andextending across the cavity and having terminal angularly relatedportions located at the saidseats.

4. An attachment plug cap consisting of a.

shell of insulating material forming a cavity for contact plates andprovided at opposite sides thereof with seats for the contact plates,said shell being also provided with an insulating partition interposedbev tween the contact plates and extending across the cavity and havingterminal angularly related portions located at the said seats and,projecting outwardl beyond the seats and forming abutments or theadjacent ends of the Contact plates.

In testimony whereof I have hereunto set my hand.

RoY HERBERT CUNNINGHAM.

